⬆️ Bump phpmailer/phpmailer from 6.4.0 to 6.4.1

Bumps [phpmailer/phpmailer](https://github.com/PHPMailer/PHPMailer) from 6.4.0 to 6.4.1.
- [Release notes](https://github.com/PHPMailer/PHPMailer/releases)
- [Changelog](https://github.com/PHPMailer/PHPMailer/blob/master/changelog.md)
- [Commits](https://github.com/PHPMailer/PHPMailer/compare/v6.4.0...v6.4.1)

Signed-off-by: dependabot[bot] <support@github.com>

composer.lock

@@ -442,23 +442,17 @@
         },
         {
             "name": "phpmailer/phpmailer",
-            "version": "v6.4.0",
+            "version": "v6.4.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/PHPMailer/PHPMailer.git",
-                "reference": "050d430203105c27c30efd1dce7aa421ad882d01"
+                "reference": "9256f12d8fb0cd0500f93b19e18c356906cbed3d"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/PHPMailer/PHPMailer/zipball/050d430203105c27c30efd1dce7aa421ad882d01",
-                "reference": "050d430203105c27c30efd1dce7aa421ad882d01",
-                "shasum": "",
-                "mirrors": [
-                    {
-                        "url": "https://mirrors.aliyun.com/composer/dists/%package%/%reference%.%type%",
-                        "preferred": true
-                    }
-                ]
+                "url": "https://api.github.com/repos/PHPMailer/PHPMailer/zipball/9256f12d8fb0cd0500f93b19e18c356906cbed3d",
+                "reference": "9256f12d8fb0cd0500f93b19e18c356906cbed3d",
+                "shasum": ""
             },
             "require": {
                 "ext-ctype": "*",
@@ -512,7 +506,7 @@
             "description": "PHPMailer is a full-featured email creation and transfer class for PHP",
             "support": {
                 "issues": "https://github.com/PHPMailer/PHPMailer/issues",
-                "source": "https://github.com/PHPMailer/PHPMailer/tree/v6.4.0"
+                "source": "https://github.com/PHPMailer/PHPMailer/tree/v6.4.1"
             },
             "funding": [
                 {
@@ -520,7 +514,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2021-03-31T20:06:42+00:00"
+            "time": "2021-04-29T12:25:04+00:00"
         },
         {
             "name": "psr/http-message",